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Learning Cycle Queries on BQ27510

RAJESH SELVARAJ
Intellectual 350 points
Other Parts Discussed in Thread: BQ27510-G3

I have few questions regarding the BQ27510-G3 Battery Learning cycle. 

1) After battery is completely drained, the RUP_DIS bit is cleared and indicates that it is right time to initiate the learning cycle. If this bit is cleared before the 5 hour relaxation time, say in 4 hours it is cleared, shall we start the learning? 

2) Is there any delay required to initiate / hit the IT enable after the battery discharged and relax done button is clicked? 

3) I am using desktop supply with 4.2V, 300mA setting to charge the battery of 3.7V, 720mA to have fast charging C/2. I believe that after battery reached 4.2V, the charging becomes CV profile.  Is that my CC/CV charging profile fine?

4) Though the FC is set as the average current is below taper current and is above quit current for more than half an hour. I consider this as charging the battery and waiting till the average current reaches to zero. This leads increase in the remaining capacity to maximum. As per the TI guidance, FC bit is set and average current is below taper current more than consecutive 40 sec is enough condition. Shall I stop charging as per TI guide or should follow what I am doing now?

5) Is it okay to proceed when VOK bit is cleared after the FC is detected or should wait till 2 hour relaxation to complete? Few times, I can see that after 2 hour, the FC bit is cleared which stops the learning. 

 6) After complete discharge, the battery is left to relax. VOK is cleared in 3 hours. Should I wait for 2 more hour or can complete the learning as the indication happens?

Thanks,

Rajesh

  • 0
    TI__Mastermind 26225 points

    Hi Rajesh,

    1. 5 hours is a recommendation for how much time to wait for RUP_DIS to clear. Once the bit clears, you can start learning.

    2. You shouldn't need a delay.

    3. Your profile looks fine. For clarification, is your battery 420 mAh?

    4. I recommend terminating the charge once the FC bit is set. Adjust your Taper Current as necessary.

    5. You can proceed when VOK and RUP_DIS are cleared. You can also monitor the Update Status Registers to make sure they go to 0x01.

    6. You can complete the learning when VOK clears. Also check to make sure Update Status goes to 0x02.

    Here is some learning cycle material for reference:0246.LearningCycleOverview.pdf

    Best Regards,

    Ben Lough

  • 0 in reply to Benjamin Lough
    Intellectual 350 points
    Thanks for the quick reply. It helps a lot and makes clear what I need to know. The battery I am using is 720 mAh capacity.
    I already read the reference material you have shared. It has confusing and indefinite statements. That is why raised these questions.

    Thanks!